fix: Allow to set adapter transmit power on startup

[Koenkk]

@Nerivec probably the ember part is wrong, feel free to update.

[Nerivec]

👍

Ember part should be:

• set tx power if mismatching from adapter
• set tx power during form (saved across reboots, so should be a noop on future restarts as long as not changed)

[Koenkk]

Thanks!